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An even large amount of bills in the form of cash stacked up on top of eachother, usually held together with a rubberband or a paper band straight from the bank. Its not a stack if its folded.
Most people go by 100's

100 hundred dollar bills $10,000
100 fifty dollar bills $5,000
100 twenty dollar bills $2,000
100 one dollar bills $100

Or you could go by 50's or 10's

50 hundred dollar bills $5,000
50 fifty dollar bills $2,500
50 twenty dollar bills $1,000
50 one dollar bills $50

10 hundred dollar bills $1,000
10 fifty dollar bills $500
10 twenty dollar bills $200
10 one dollar bills $10

All of these can be excepted as a Stack. It just depends on how wealthy you are.
"Aye, Im rollin in the checks, I got stacks on the deck."
-me

"We be stackin this paper up"

"Last night i hit the strip club with a stack and made it fucking rain."
Stack by JakeSAUCE December 18, 2007
Originally "100 bills", bound in a paper ribbon.

Among black people and proles of America it's synonymous with a grand, in any combination of bills.
Tool: "I hope you brought some cash."
Poser: "I got a stack on deck, bitch!"
Tool: "A stack of?"
Poser: "A grand, fool!"
Tool: "You brought a stack of monopoly money? We got a high roller here."

Contrary to popular belief, it's legal to carry a stack of 100s around without declaring it to the Treasury.* Just be white or famous.
stack by reallynotreal February 6, 2015
To be able to apply more than once, or combine with something else that has the same effect. Comes from video games and pen-and-paper RPGs.
The flyer says "30% off all jeans". Does that stack with the student discount?
stack by Seahen June 26, 2011
a myth created by ecstasy dealers to get you to pay more for pills, by staing they're double or triple "stacked" they imply that there is more MDMA (ecstasy) in the pill. in reality, it means nothing.
guy: "hey, i got triple stacked blue dolphins"

me: "how much are they?"

guy:" thirty apiece, but they're triple stacks, man..."
Stack by MollySurprise! March 24, 2009
to fall over or crash badly resulting in great injury or damage
Stu: How did you break your legs?
Al: I was running down the stairs and i stacked it big time
stack by Wise Man July 15, 2003
Ay Man, this icy weather is killin' my money! I lose a stack every day I don't work. I'm finna find another hustle, fa real!
Stack by Terry Bad Ice January 30, 2019